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MV design guide - Schneider Electric

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General contents<br />

<strong>MV</strong> <strong>design</strong> <strong>guide</strong><br />

Presentation 5<br />

Metal-enclosed factory-built equipment 5<br />

Voltage 6<br />

Current 8<br />

Frequency 9<br />

Switchgear functions 9<br />

Different types of enclosures 10<br />

Design rules 11<br />

Short-circuit power 11<br />

Short-circuit currents 12<br />

Transformer 13<br />

Synchronous generator 14<br />

Asynchronous motor 14<br />

Reminder 15<br />

Three phase calculation example 17<br />

Busbar calculation 21<br />

Thermal withstand 24<br />

Electrodynamic withstand 27<br />

Intransic resonant frequency 29<br />

Busbar calculation example 31<br />

Dielectric withstand 38<br />

Dielectric strength of the medium 38<br />

Shape of parts 39<br />

Distance between parts 39<br />

Protection index 41<br />

IP code 41<br />

IK code 41<br />

Switchgear definition 45<br />

Medium voltage circuit breaker 45<br />

Current transformer 54<br />

Voltage transformer 61<br />

Derating 64<br />

Units of measure 67<br />

Basic units 67<br />

Common magnitudes and units 67<br />

Correspondence between Imperial units<br />

and international system units (SI) 69<br />

Standards 71<br />

Quoted standards 71<br />

IEC-ANSI comparison 72<br />

References 81<br />

<strong>Schneider</strong> <strong>Electric</strong> documentation references 81<br />

Index 83<br />

<strong>Schneider</strong> <strong>Electric</strong><br />

Merlin Gerin <strong>MV</strong> <strong>design</strong> <strong>guide</strong><br />

3

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